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How much oil do you put into a 1990 Buick Electra?

The amount of oil a 1990 Buick Electra needs depends on the engine it has. There were several engine options available for that year. You absolutely must check your owner's manual. This manual will specify the exact oil capacity for your particular engine.

Looking up the capacity online without knowing the engine size is unreliable and could lead to overfilling or underfilling, both of which can damage your engine.

If you don't have the owner's manual, you can often find a PDF version online by searching for "[Your Buick Electra Engine Size] owner's manual". You'll need to find the engine size (e.g., 3.8L, 4.1L, etc.) usually found on a sticker under the hood or on the driver's side doorjamb.